<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            background-color: gray;
        }
    </style>
</head>
<body>
    <div></div>
    <script>
        // 1.获取div元素
        var div = document.querySelector('div')
        // 2.绑定点击事件
        div.onclick = function(e){
            // 3.书写点击时执行的代码
            console.log(e)
            console.log('ok')
        }
    </script>
</body>
</html>